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Zr-based Alloys under irradiation

#3692


Fundamental Investigations of Processes, Responsible for Changes in Crystallographic Texture and Microstructure of Model Samples from Zr-Based Alloys under Neutron Irradiation

Tech Area / Field

  • FIR-MAT/Materials and Materials Conversion/Fission Reactors
  • PHY-SSP/Solid State Physics/Physics

Status
3 Approved without Funding

Registration date
26.01.2007

Leading Institute
MIFI, Russia, Moscow

Supporting institutes

  • NIIAR (Atomic Reactors), Russia, Ulianovsk reg., Dimitrovgrad

Collaborators

  • Global Nuclear Fuel, USA, NC, Wilmington

Project summary

Objective: To grasp a concept of fundamental regularities of atomic movements in anisotropic materials with hexagonal close-packed (HCP) crystalline lattice by the example of Zr-based alloys under high-dose irradiation causing changes in microstructure and texture of model samples and, thus, effecting their radiation deformation and radiation hardening.

Basic Task: Experimental examination of such micro-structural changes as distortion of crystalline lattice, composition and morphology of secondary phases, phase transformations and amorphization, dislocation structure of zirconium alloys of different composition (a Zr-Sn-Nb-Fe-Cr-Ni system) characterized by different initial texture and structural states dependent on thermo-mechnical treatment under high-dose neutron irradiation (neutron fluences up to ~1026 m-2, Е>1 MeV) in reactors differing in neutron parameters (density and energy spectrum) and the relation between these changes and the changes of the material texture peculiarities and macroscopic characteristics.

Engineering Field: Solid state physics / Reactor material science.

Expected Results and Effectiveness of their Usage: During the Project implementation methods for X-ray micro-structural and texture examinations of irradiated Zr-based model samples will be developed. Experimental data on the changes in the microstructure and crystallographic texture of the model samples under high-dose irradiation will be obtained, and correlation between the irradiation-caused sub-structural changes (including the dislocation structure), results of alloying element redistribution in the secondary phase precipitates and the solid solution of Zr–based alloy matrix and possible texture changes will be determined, too. The dependence of these changes on the parameters of preliminary cold deformation and recrystallization will be revealed, and the relation between the changes and the dose dependence of irradiation-induced growth will be analyzed.

The results obtained will contribute to the development of theoretical conceptions of radiation damageability of metal solid bodies with an anisotropic HCP structure. Basing on the analysis of the revealed regularities of micro-structural and texture changes of the Zr-based model alloys under high-dose irradiation, the notions of the irradiation-induced growth and radiation hardening mechanisms will be defined more precisely that will form the basis for developments of new models of these phenomena.


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